Really not effective

I bought this scanner to retrieve old photos I had on slides and negatives because seen the price of reprint (1 per reprint) I opted for this solution.
This scanner made me lose hours for nothing because it is very capricious. Already the user manual is not very explicit, and navigation with the buttons is catastrophic. It bugged about every 3 or 4 slides or negatives and you must restart the device, because nothing answer. And when you come somehow scanner your pictures and you looked at the result on the PC, you realize that ultimately there are a few that are not entirely scanner. and when you put the SD card into the device and erase everything that you without warning then this is the pompom. In short neither one nor two I returned for more patience. And I took the blow I found a cheaper model at 29.90 [...]. Com and is a simplicity and unprecedented speed. I have all my slides and negatives scanner in less than an hour.
That ultimately is I had a bad model for rollei is it really to flee.